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Fencer Vulns
high 7.5

CVE-2026-76172 json

fast-uri vulnerable to host confusion via percent-encoded scheme normalization

published 2026-08-24 2 mo ago modified 2026-10-14 25 d ago also GHSA-jqff-g426-hqxp , EUVD-2026-64773

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

fast-uri is a URI parser for Node.js. During parsing it runs a legacy decoding pass over the scheme component and never re-escapes the result, and serialization writes the scheme back out verbatim, unlike the host component which is re-escaped. As a result an input whose scheme carries percent-encoded slashes parses as a scheme with no authority, so the parsed host and error are both undefined, yet resolving or normalizing that same input emits a network-path reference whose authority is attacker-chosen and re-parses to that host. An application that allowlists on the parsed host, or treats a reference with no authority as safe to resolve against its base, gets the opposite of what it checked, giving an off-site redirect, server-side request forgery, or address-policy bypass. The legacy decoder also expands non-standard escape forms, widening the issue past upstream filters, and control characters in the scheme can reach the output as raw carriage return and line feed. The affected versions are 2.3.1 up to but not including 2.4.5, 3.0.0 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which reject a scheme that is not valid after decoding. Users should upgrade to a patched version.

Patch / fix

  • npm fast-uri 2.4.5, 3.1.6, 4.1.3
  • fast-uri fast-uri 2.4.5, 3.1.6, 4.1.3
  • node-ajv Debian 14 8.20.0~ds+~cs7.1.4-1

debian advisories DEBIAN-CVE-2026-76172

  • cockpit-image-builder RHEL 10.2 94.4-1.el10_2
  • grafana12.4 hummingbird 1 12.4.9-0.4.hum1
  • grafana13.2 hummingbird 1 13.2.0-0.1.2.hum1
  • grafana13.1 hummingbird 1 13.1.3-0.3.hum1

red hat advisories RHSA-2026:71543RHSA-2026:60866RHSA-2026:60856RHSA-2026:60855

  • cockpit-image-builder AlmaLinux 10 94.4-1.el10_2

almalinux advisories ALSA-2026:71543

  • cockpit-image-builder Rocky Linux 10 94.4-1.el10_2

rocky linux advisories RLSA-2026:71543

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-76172 updated cvss 7.5

fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects

  • Red Hat Cost Management On Premise costmanagement/costmanagement-ui-rhel10 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-console-plugin-rhel9, openshift-lightspeed/lightspeed-agentic-console-rhel9, openshift-lightspeed/lightspeed-console-plugin-419-rhel9, openshift-lightspeed/lightspeed-console-plugin-pf5-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-hub-ui-rhel8, openshift-pipelines/pipelines-hub-ui-rhel9, openshift-pipelines/pipelines-console-plugin-rhel9, openshift-pipelines/pipelines-console-plugin-pf5-rhel9 Red Hat OpenShift Serverless openshift-serverless-1/kn-eventing-integrations-transform-jsonata-rhel9
    affected: workaround, no fix available “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.”
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-24/lightspeed-rhel8, ansible-automation-platform-25/lightspeed-rhel8, ansible-automation-platform-26/lightspeed-rhel9
    affected: workaround, no fix planned “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.”
  • Red Hat build of Apicurio Registry 3 apicurio/apicurio-registry-ui-rhel8 Red Hat Build of Podman Desktop rh-podman-desktop.git 1.1.0 Red Hat Enterprise Linux 9 sgx-mpa, tdx-qgs, sgx-libs, sgx-pccs, sgx-common, sgx-pccs-admin, +2 more Red Hat Enterprise Linux 10 linux-sgx 2.26-7.el10, rh-podman-desktop 1.1.2-1.el10_2
    affected: workaround, no fix available “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.”
  • Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-gaudi-rhel9, rhelai3/disk-image-cuda-rhel9
    affected: workaround, no fix available, no fix planned “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-core-bff-rhel9, rhoai/odh-dashboard-operator-rhel9, rhoai/odh-mod-arch-agent-ops-rhel9 Red Hat OpenShift Container Platform 5 openshift5/ose-monitoring-plugin-rhel9, openshift5/nmstate-console-plugin-rhel9 Red Hat Openshift Data Foundation 4 odf4/mcg-core-rhel9, odf4/ocs-client-console-rhel9, odf4/odf-multicluster-console-rhel9 Red Hat OpenShift Dev Spaces devspaces/code-rhel9
    affected: workaround, no fix available “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.”
  • Red Hat Secrets Management Console for Red Hat OpenShift external-secrets-management/console-plugin-rhel9
    affected: workaround, no fix planned “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.”
  • Red Hat Cluster Observability Operator 1.5 cluster-observability-operator/distributed-tracing-console-plugin-rhel9 1793661918, cluster-observability-operator/distributed-tracing-console-plugin-rhel9 1793824908, cluster-observability-operator/troubleshooting-panel-console-plugin-rhel9 1790854494, cluster-observability-operator/distributed-tracing-console-plugin-pf4-rhel9 1793661804, cluster-observability-operator/distributed-tracing-console-plugin-pf4-rhel9 1793823428, cluster-observability-operator/distributed-tracing-console-plugin-pf5-rhel9 1793664067, +3 more
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:95591
  • Red Hat multicluster engine for Kubernetes 2.11 multicluster-engine/console-mce-rhel9 1790133081
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:72848
show 23 more
  • Red Hat multicluster engine for Kubernetes 2.17 multicluster-engine/console-mce-rhel9 1790135323
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:72849
  • Red Hat Network Observability (NETOBSERV) 1.12.3 network-observability/network-observability-console-plugin-rhel9 1789978277, network-observability/network-observability-console-plugin-pf5-rhel9 1789978780
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:70593
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/console-rhel9 1788283612, rhacm2/console-rhel9 1788880980
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:67542
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/console-rhel9 1788883472
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:67543
  • Red Hat Ansible Automation Platform 2.1 ansible-automation-platform/automation-portal 1788775748
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:65118
  • Red Hat Ansible Automation Platform 2.2 ansible-automation-platform/automation-portal 1788783591, ansible-automation-platform/bootc-automation-portal-rhel9 1791865660
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:65155
  • Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-tech-preview/mcp-server-rhel9 1789669036
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:71179
  • Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/mcp-server-rhel9 1788915736
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:67279
  • Red Hat Developer Hub 1.9 rhdh/rhdh-hub-rhel9 1789554285
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:69248
  • Red Hat Developer Hub 1.10 rhdh/rhdh-hub-rhel9 1791311495, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator 1791250003, rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend 1791242697, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend 1791251282, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-form-widgets 1791250794, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend-module-loki 1791250355, +1 more
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:76788
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1788206196
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:61783
  • Red Hat Edge Manager 1.1 rhem/flightctl-ui-rhel10 1789486181, rhem/flightctl-ui-ocp-rhel9 1789486446, rhem/flightctl-ui-ocp-rhel10 1789486226
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:68044
  • Red Hat Edge Manager 1.2 rhem/flightctl-ui-rhel9 1789486750, rhem/flightctl-ui-rhel10 1789488111, rhem/flightctl-ui-ocp-rhel9 1789486476, rhem/flightctl-ui-ocp-rhel10 1789485920
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:68006
  • Red Hat Enterprise Linux AppStream (v. 10) cockpit-image-builder 94.4-1.el10_2
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:71543
  • Red Hat Hardened Images grafana12.4 12.4.9-0.4.hum1, grafana13.1 13.1.3-0.3.hum1, grafana13.2 13.2.0-0.1.2.hum1
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:60866
  • Red Hat Migration Toolkit 1.8 rhmtc/openshift-migration-ui-rhel8 1789546373
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:68681
  • Red Hat OpenShift AI 2.25 rhoai/odh-dashboard-rhel9 1791853525, rhoai/odh-feature-server-rhel9 1792148523, rhoai/odh-mod-arch-model-registry-rhel9 1791853432
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:87410
  • Red Hat OpenShift AI 3.4 rhoai/odh-dashboard-rhel9 1791861020, rhoai/odh-mod-arch-maas-rhel9 1791860708, rhoai/odh-feature-server-rhel9 1791863220, rhoai/odh-mod-arch-automl-rhel9 1791861032, rhoai/odh-mod-arch-gen-ai-rhel9 1793001896, rhoai/odh-mod-arch-mlflow-rhel9 1791861383, +3 more
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:84734
  • Red Hat OpenShift AI 3.5 rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 1791825469
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:86891
  • Red Hat OpenShift Container Platform 4.21 openshift4/nmstate-console-plugin-rhel9 1789592806
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:68547
  • Red Hat OpenShift Container Platform 4.22 openshift4/nmstate-console-plugin-rhel9 1789567849
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:68553
  • Red Hat Openshift Data Foundation 4.19 odf4/odf-console-rhel9 1793126829
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:92650
  • Red Hat OpenShift Dev Spaces 3.30 devspaces/dashboard-rhel9 1789162884
    fixed: vendor fix “There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.” RHSA-2026:68754

2 more fixed, 42 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
npm fast-uri
>=2.3.1, <2.4.5
>=3.0.0, <3.1.6
>=4.0.0, <4.1.3
2.4.5
3.1.6
4.1.3

Affected products

  • fast-uri fast-uri

Classification

Weakness
  • CWE-177 Improper Handling of URL Encoding (Hex Encoding)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.